I've got a wizard that I call whit method that executes on button click. In the wizard I have a Many2one field on project.task that I want to filter. So in the method that calls the wizard, I get the action for the wizard popup, search the task ids that I want to show and then pass them into the actions domain. But when the wizard shows the field is not filtered.

Wizard:

parent_id = fields.Many2one('project.task')

Task:

def add_as_subtask_wizard(self):
	action = self.env.ref('tabla_bi_subtask_extension.action_add_as_subtask_wizard').read()[0]
	if action:
            tasks_ids = self.search([ 
			('id', '!=', self.id),
			('project_id', '=', self.project_id.id),
			('parent_id', '=', False),
		]).ids
		if len(tasks_ids) > 0:
			action['domain'] = {'parent_id': [('id', 'in', tasks_ids)]}

		return action